Few ultrasound predictions have 100 percent accuracy. In fact, many ultrasound reports do not indicate the gender in the written copy even when the sonographer reports it to the patient. Of course, the accuracy of the prediction will be greater with advancing gestational age, the experience of the sonographer, and even the position of the fetus. As a practical matter, if an ultrasound technician indicates the gender with a high degree of confidence, it is probably reasonable to only consider names for that gender. There are a few medical circumstances in which knowing the gender is absolutely essential. In these cases, several ultrasounds can be done or often, the doctors will seek to determine the genetic gender through amniocentesis or chorionic villus sampling.

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